macOS Monterey Heroku CLI error when running remote command

Question

I'm trying to run this command in a Heroku deployed application:

heroku run 'POOL_SIZE=2 iex -S mix' -a name-of-the-app

And after waiting like a minute or so I get this error:

I found this article and already disabled the AirPlay Receiver but the issue keeps happening.

This is the error I get in the application logs:

I'm using an M1 Pro macOS Monterey 12.1 with the Heroku CLI on the latest version installed via brew